{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "The structure of M4a and M4c were confirmed to be ertugliflozin - 4 - O - beta - and - 3 - O - beta - glucuronide , respectively , via comparison of the HPLC retention time and mass spectra with authentic standards ."}
{"Chemical": ["ertugliflozin - 4 - O - beta - and - 3 - O - beta - glucuronide"]}